Computing machine



July 19, 1932. F A, H RT 1,868,062

COMPUTING MACHINE Filed Jan. 27, 1928 5 Sheets-Sheet l WITNESSES INVENTOR fM Mvmi?" BY W ATTORNEY July 19, 1932. A HART 1,868,062

COMPUTING MACHINE Filed Jan. 27, 1928 3 Sheets-Sheet 2 'WITNESSES INVENTOR ATTORNEY July 19, 1932. H 1,868,062

COMPUTING MACHINE Filed Jan. 27, 1928 3 Sheets-Sheet 3 INITIAL POSITION WITNESSES BY Mail il ATTORNEY INVENTOR Patented July 19, 1932 UNITED STATES PATENT OFFICE FREDERICK A. HART, OF NEW BRITAIN, CON N EGTIGUT, ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, OF ILION, NEW YORK, CORPORATION OF NEW YORK COMPUTING MACHINE Application filed January 27, 1928.

My invention relates to computing machines and especially to combined typewriting and computing machines.

My invention has for its principal object to provide certain improvements in connection with the clearance proof mechanism of an algebraic totalizer.

To the above and other ends my invention consists in certain features of construe tion and combinations and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

One form of my invention is illustrated in the accompanying drawings, in which Fig. 1 is a front elevation of a Remington computing machine, Model No. 23, having my invention applied thereto.

Fig. 2 is a right-hand side elevation of the algebraic totalizer with part of the side plate sectioned away and showing the parts in the positions they occupy just after the transscribing of a negative total.

Fig. 3 is a view similar to Fig. 2 but showing the parts in the positions they occupy after the transcribing of a positive total.

Fig. 1 is a front elevation of the totalizer and some associated parts, said totalizer having a portion of a casing plate broken away.

Fig. 5 is a fragmentary top view showing a detail.

Fig. 6 is a diagrammatic view of the algebraic computing mechanism.

Fig. 7 is a fragmentary perspective view of some of the mechanism in the totalizer.

Figs. 8, 9 and 10 are fragmentary front views of the pick-up mechanism for the cross truck, the mechanism being shown in initial position in Fig. 8, in units position in Fig. 9, and in sub-units position in Fig. 10.

Fig. 11 is a perspective view of a key lock mechanism The model 23 Remington accounting machine comprises a Remington typewriter of which the frame 1 is shown and also thenu- Serial No. 249,883;

meral print-ing keys 2. The machine of course comprises the usual typewriting mechanism. including carriage, plate-n, typebars, etc. The computing mechanism may be of the usual Remington type which is similar to that shown in the patent to John C. Wahl, No. 1,270.471, dated June 18, 1925, and as far as the present invention is concerned said mechanism, with exceptions described herein, may be identical with that shown in said patent to Wahl.

As shown in the present instance the computer includes an actuator frame and easing 3, the actuating mechanism including a vertical master wheel 4 and a cross master wheel 5. The direction of rotation of the vertical master wheel 4 on the depression of the numeral keys 2 is controlled primarily by a handle 6 which can be set in a slot 7 to three different positions for add, disconnect and subtract. The direction of rotation of the cross master wheel 5 is controlled primarily by a follower 8 consisting of a roller mounted on the end of an arm 10, which in turn is mounted on a rock shaft 11 in the actuator 3. The follower 8 has three positions determined by the up and down adjustment of cams 12 mounted on the vertical totalizers, of which four, numbered 13, 14, 15 and 16, are shown, the high position of one of these cams causing addition, the low position subtraction, and anintermediate position disconnect. The direction of rotation of both master Wheels can be reversed at once by depressing either a correction key 17 or a so-called credit-balance key 18, the latter connecting with a rock shaft 20 which controls not only the reversing of the master Wheels but which may also control the color of the printing. The construction of these parts, namely, the

correction key 17, the credit-balance key 18,

the rock shaft 20, and also a release key 21, are all described in the patent to Frederick A. Hart, No. 1,587,304 dated June 1, 1926. The key 17 is used for a temporary reversal totalizer.

said bar. move leftwardfrom theposition shown in in order to make a correction and the key 18 not only reverses the master wheels but also changes the color of the printing, and this key when depressed is locked down so that a credit-balance may be written with the master wheels reversed and in a distinctive color, after which the parts may be restored to normal position by pressing the release key 21 which unlocks the credit-balance key.

The vertical totalizers are mounted on the usual truck 22 connected to arms 23 of the typewriter carriage.

The cross totalizer 24 is mounted on a cross truck 25 which can slide back and forth, being drawn leftward by the vertical totalizers and being restored to the right by a spring 26 running over a roller 27. This cross truck is provided with the usual adjustable stop 28 for cooperation with the usual locking lever 30, which locking lever acts through another lever 31 in a manner well understood.

The cross truck is drawn leftward by a pickup beam32, Figs. 8, 9 and 10, having a lug or hook 33 which engages the pick-up foot 34 on the right-hand side plate of each vertical 7 The pickup beam is pivoted at 35 to a bracket 36 mounted on the cross truck 25 and it is influenced to swing upward about said pivot by a spring 37 connected to said bracket and to a pin 38 projecting from the beam 32. Said beam has projecting forward therefrom a pin or stud 40 which runs in a guide slot 41 in a frame plate 42 secured in the actuator. This slot is horizontal for the greater part of its length but near its lefthand end it has a downward incline 43 which camsthe pin 40 downward and releases the lug 33 from the foot 34, as shown in Fig. 10.

A so-called safety-bar 44 is also pivoted to the bracket 36 on the same pivot 35 as the pick-up beam, and this has in it holes through which the pins 38 and 40 project forward, said holes being large enough to al low of independent vibration of the beam and bar. The pin 40 has a wide flange 45 on it to guide the safety-bar 44. This safety-bar terminates at its left-hand end a distance to the right ofv the lug 33 about equal to the thickness of the side plate of the totalizer so that during the time when the totalizer is traveling through a computing zone the end of said bar is adjacent to the side plate as indicated in dotted lines in Fig. 9 and prevents the cross truck from running ahead of the vertical totalizer. This safety-bar 44 has a depending part made with a V-shaped slot 46 adapted when the cross truck is in its extreme right-hand position to engage over a stationary pin 47 and thus to cam the free end of the bar 44 downward out of the path of the foot 34 of the vertical totalizer so that V the typewriter carriage can be drawn back toward the right without said foot striking When the cross truck begins to Fig. 8, the slot 46 quickly moves away from the pin 47 and allows the bar 44 to rise under the influence of a spring not shown. The pin 47 is rigidly mounted as usual on an adjustable plate 48.

The machine as thus far described is substantially identical with that which is now being marketed and is known commercially as the Remington No. 23 machine.

The cross totalizer 24, in the form shown in the drawings, is an algebraic totalizer which in the main is identical with that described in the application of L. S. McCorn, Serial No. 244,914, filed January 6, 1928, but

with certain additions which will be pointed chine; also the usual intermediate or idler gears 56 mounted on the shaft 57 and meshing with the usual pinions 58 rigid with the dials 60; Allof this mechanism and other mechanism that cooperates with it, including a universal locking bar 61 for the levers 54, are constructed substantially as has been heretofore customary in Remington totalizers. The McCorn totalizer also includes clearanceproof mechanism comprising a feeler comb 62 pivoted at 63 and having projecting rearward therefrom an arm 64 which is articulated with an arm 65 pivoted on the upper cross shaft 66 on which some of the levers 54 are pivoted. The arm 65 is drawn upward by a spring 67 acting to press the comb 62 against the dial pinions 58. Said arm is integral with a vertical arm or finger 68 which cooperates with a cam 70 pivoted in the actuator framework. Each pinion 58 has one tooth 71 made shorter than the rest, and this is in register with the comb 62 when the dial stands at zero. When all of the dials 60 stand at Zero the comb can swing forward driven by the spring 67, resulting in the finger 68 being swung rear ward into position to raise the cam 70 as indicated in Fig. 3, thus showing that all of the dials 60 stand at Zero. If any one or more of said dials does not stand at zero a long tooth of a dial pinion will hold the comb 62 rearward and the finger 68 forward, as shown in Fig. 2.

In the McCorn algebraic. totalizer a second set of dials 72 is mounted on a shaft 73 and provided with pinions 74 which mesh with the ly imprinted thereon two different sets of numerals, one for positive, and the other for negative totals. The side plates 5-0 are of course enlarged to have the shaft 73 mounted therein, and the front cover plate 75 is made as shown in Figs. 2 and 3 so as to be curved about the front faces of the dials 60 and 72, said plate being made with an upper slot 76, Fig. 4, to display the positive totals on the dials 60 and a lower slot 77 to display the negative totals on the dials 72.

An upper shutter 78 has end plates or arms 80 pivoted on the shaft 59 and a lower shutter 81 has end plates or arms 82 pivoted on the shaft 73, the first shutter to hide the upper wheels when a negative total is being read and the second to hide the lower wheels when a positive total is being read. A handle 83, projecting forward through a slot in the cover plate 75, is integral with a plate 84 whose hub 85 is pivoted on the shaft 57, and this plate has two pins 86 projecting therefrom into slots 87 in the arms 80 and 82, in such wise that when the handle 83 occupies its normal lower position, shown in Fig. 3, the shutter 81 will hide the lower dials 72, and when the handle is raised to its upper position, shown in Fig. 2, the upper shutter 78 will hide the upper dials 60. V

The handle 83 also enters the fugitive 1 into the totalizer. To this end the plate 84 is provided with gear teeth which mesh with teeth 88 formed on the periphery of a wheel 90 mounted on the shaft 52 just to the right of the units carrying wheel 51. As best shown in Fig. 7 this wheel 90 has some of the features of the carrying wheels 51. Like said carrying wheels it is made of one integral piece of steel but, as it were, in three strata or planes, the left-hand one having a smooth periphery 91 with one depression or concavity 92, the middle stratum or plane is made with a smooth periphery 93 and one carrying tooth 94 identical with the carrying teeth 95, Fig.6, of the regular carrying wheels 51. In Fig. 6 the wheel 51 is shown partly in section at the juncture of the middle and right-hand strata.

'In said regular carrying wheels each of the teeth 95 is integral with one of the regular gear teeth which occupy' the right-hand stratum or plane of the wheel. But in the case of the wheel 90 the tooth 94 is integral with the short flange 96 which occupies a portion of said third or right-hand stratum, another portion of said stratum being occupied by the teeth 88. This third stratum also includes two lugs 97 and 98, one on each side of a stop pin 100 projecting inward from the right-hand casing plate 50 and-limiting the nose 101 to engage one side or the other as the case maybe of the lug 97 and to act as a dethe lug 97 being beveled or inclined said nose and the lever 103 yield when the wheel 90 is turned by the handle 83. Vlhen said wheel is turned the tooth 94 acting'on a Geneva wheel 53 carries 1 to the units wheel in the appropriate direction, that is to say, positively when the handle 83 is pulled downward and negatively when said handle is pushed upward.

The clearance-proof mechanism may be of the lock-proof of clearance type illustrated in the patent to A. F. Poole, No. 1,491,167, dated'Apr. 22, 1924, or of the star-proof of clearance type shown in my application Serial No. 61,471 filed Oct. 9, 1925', now Patent No. 1,737,586, dated December 3, 1929. That illustrated in the drawings are like that shown in my said patent. The cam 7 0 is part of a lever pivoted at 105 to a frame plate 106, and it is urged downward by a spring 107. Said lever is at its free or left-hand end articulated with a bell crank 108 pivoted at 110 and having a lockingtooth 111 whichnormally projects into the path of a bell crank 112 pivoted to one of the frame plates 113 of the actuator. This bell crank has one of its arms connected by a link 114 with the key 115, which key prints the star. The construction is such that the key 115 is normally locked and it is unlocked only when the cam is lifted by the finger 68 as shown in Fig. 3. It will be perceived that this can happen only when the cross totalizer has jumped back to its righthand position at a time when the positive dials 60 stand at zero, as shown in Fig. 3. Before copying a negative total the handle 83 is raised to the position shown in Fig. 2 which moves a shutter over the positive dial 60 and exposes the negative dial 72 and at the same time carries the fugitive 1 subtractively into the register train. The operator must needs raise this handle before coming into the computing column in which the balance or total is to be copied in order to observe in what denomination the first digit of the total is to be written so as to know which one of the decimal tabulator keys to operate. The total is copied with the handle 83 in its upper position and when said total is copied correctly the negative dials 72 will show clear, but the positive dials will all stand in their 9 positions as shown in Fig. 2 and the clearance-proof mechanism of the totalizer terminating with the finger 68 will show not clear. If now the cross totalizer made its jump back the finger 68 wouldmove in front of the cam 70 and the star-key would not be unlocked. If at that time the handle 83 were to be moved down to its lower or positive position the addition of thefugitive 1 would bring the positive dials to their zero positions, but the finger 68 would at that time be standing in front of the cam 70 as shown in Fig. 2 and the spring 67 would therefore be unable to move said finger to its rear position and the star-key would not be unlocked. In order to get the benefit of the clearance-proof mechanism therefore, the operator would have to move the cross totalizer by hand to its left-hand position, then move the handle 83 to its lower position and allow the cross truck to jump back to its right-hand position. In order to avoid the inconvenience of this mode of operation I have provided means whereby when the total is written with the handle 83 in its upper position the cross totalizer will not make its jump back but will be latched in the extreme left-hand position that it occupies when the pick-up beam 32 is cammed loose from the vertical totalizer,in other words, in its subunits position. The cross totalizer will remain in that position until the operator pulls the handle 83 down in its Fig. 3 position, which operation will release the latch and allow the cross totalizer to jump back. At this time if the total was correctly copied the positive dial 60 will stand at zero and the clearance-proof mechanism will operate correctly. This mode of operation entails no inconvenience because the handle 83 needs to be pulled down anyway and it might just as well be pulled down at that time as at any other.

In order to latch the cross truck in its subunits position after the writing of a negative total a latch lever or detent 116 is pivoted on the shaft 52 in that letter space position of the totalizer just to the right of the wheel 90, said latch lever having an upwardly projecting thin arm 117 which is acted on by a tension spring 118 connected with the stud 100. The lever 116 projects below the general level of the totalizer 24 terminating just a little above the horizontal frame plate 120 of that part of the actuator. The framing of the actuator includes a transverse bar 121 to which a stationary plate 122 is secured by screws 123. A portion of this plate is bent horizontally rearward and is made with an inclined edge 124 and with an abrupt edge 125 to act as a keeper for the lower end of the latch lever 116. The construction is such that as the totalizer travels step by step left ward the arm 116 will be cammed rearward by the incline 124 and just before the lug 33 is cammed free of the pick-up foot 34 this lever snaps into engagement with the abrupt edge 125 as shown in Figs. 2 and 5, thus latching the cross totalizer against jumping back.

In order to restore the latch 116 when the handle 83 is pulled downward said latch is made with a forwardly extending arm 126- an arm or lug 127, so situated that when the lever 83 is in its upper position shown in .Fig. 2 it lies just above the arm 126 and when said lever 83 is pulled downward the arm 127 depresses the arm 126 and releases the latch 116 as shown in Fig. 3 and said latch will be held in its released position as long as the arm 83 remains in its lower or positive position.

Since it is intended that the handle 83 be pulled down while the cross totalizer is latched in its left-hand position the units wheel of the totalizer will be turned by the pulling down of said handle and it is essential therefore that said units wheel be free from the master wheel 5 at the time. This means that the totalizer must be latched after having made almost a complete step beyond units position. At the same time the beam must be released from the vertical totalizer before the step to sub-units position is quite completed, because if when the handle 83 was pulled down said pick-up beam was not quite yet free the cross truck would not jump back and the star-key could not be operated in sub-units position as it is desirable it should be. The precise point at which the pick-up beam 32 is freed from the vertical totalizer needs therefore to be determined with somewhat greater precision than has heretofore been necessary. As heretofore constructed the incline 43 which acting on the pin 40 frees the pick-up beam 32 from the vertical totalizer, has consisted of a portion of the stationary plate 42; but in the present instance it is preferable to make this incline adjustable in order to attain the requisite accuracy. To this end the upper wall of the slot 41 is continued in a straight line to the left-hand end of the slot and the incline 43 is made on an adjustable piece 128 secured to the face of the plate 42 by screws 130 passing through slots 131. This plate 128 can be adjusted right and left so as to cause the lug 33 to be freed from the foot'34 at exactly the desired position.

Latching the cross truck in sub-units position might expose the machine to the danger that the carirage might be drawn back to the right while the cross truck was so latched, in which event the pick-up foot 34 of a vertical totalizer might strike the abrupt end of the safety-bar 44 and injure the mechanism, especially if the adjustments were not quite correct. provided means to cam this safety-bar downward before the lug 33 is freed from the foot 34. To this end the depending part of said bar is made with a leftward prolongation 132 having on its upper edge an incline 133 adapted to engage a stationary part so as to cam this bar downward. In the Remington machine the rock shaft 11 happens to be conveniently situated for the purpose and the incline 133 istherefore de-l For this reason I have signed to engage said rock shaft during the step of the carriage from its tens to its units position, so that when the carriage is in its units position as shown in Fig. 9 the safetybar 44 is already cammed down out of danger, and it remains so cammed down when the parts move to sub-units position as shown in Fig. 10.

Various changes may be made in the details of construction and arrangement without departing from the invention.

What I claim as new and desire to secure by Letters Patent, is

1. The combination of a jumping device containing algebraic totalizing mechanism and containing also a device settable in one position for the copying of a positive total and to another position for the copying of a negative total, clearance-proof mechanism for proving a positive zero position of the totalizing mechanism, a latch capable of preventing the jump-back of said jumping device, and means whereby said latch is controlled by said settable device.

2. The combination of a jumping device containing algebraic totalizing mechanism and containing also a device settable to one position for the copying of a positive total and to another position for the copying of a negative total, anda detent to prevent the jump-back of said jumping device during the time when said settable device is set in one of its two positions.

3. The combination of algebraic totalizing mechanism including means for inserting the fugitive l, a traveling carriage and a lock for said carriage controlled by said inserting means.

4:- The combination of algebraic totalizing mechanism including means for inserting the fugitive 1, clearance-proof mechanism and means dependent on said inserting means to prevent an operation of said clearance-proof mechanism until said fugitive 1 shall have been inserted.

5. The combination of algebraic totalizing mechanism having means whereby it can be set for positive and negative, a key, means operated by said key for printing a clearance signal, and means dependent for its action on said setting means for preventing an operation of said key except when said totalizer is set for positive.

6. The combination of a jumping device, algebraic totalizing mechanism and a shifter for setting said totalizer mechanism for positive and negative readings, a latch mounted on said device, a keeper mounted on the stationary frame work, and a lug on said shifter for operating said latch.

7. In a machine including an algebraic totalizer, the combination of clearance proof mechanism including a feeler adapted to detect a positive zero condition of the totalizer, a device settable to insert the fugitive one and FREDERICK A. HART. 

